1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/views/controls/table/table_header.h"
6
7#include "third_party/skia/include/core/SkColor.h"
8#include "ui/base/cursor/cursor.h"
9#include "ui/gfx/canvas.h"
10#include "ui/gfx/text_utils.h"
11#include "ui/native_theme/native_theme.h"
12#include "ui/views/background.h"
13#include "ui/views/controls/table/table_utils.h"
14#include "ui/views/controls/table/table_view.h"
15#include "ui/views/native_cursor.h"
16
17namespace views {
18
19namespace {
20
21const int kVerticalPadding = 4;
22
23// The minimum width we allow a column to go down to.
24const int kMinColumnWidth = 10;
25
26// Distace from edge columns can be resized by.
27const int kResizePadding = 5;
28
29// Amount of space above/below the separator.
30const int kSeparatorPadding = 4;
31
32const SkColor kTextColor = SK_ColorBLACK;
33const SkColor kBackgroundColor1 = SkColorSetRGB(0xF9, 0xF9, 0xF9);
34const SkColor kBackgroundColor2 = SkColorSetRGB(0xE8, 0xE8, 0xE8);
35const SkColor kSeparatorColor = SkColorSetRGB(0xAA, 0xAA, 0xAA);
36
37// Size of the sort indicator (doesn't include padding).
38const int kSortIndicatorSize = 8;
39
40}  // namespace
41
42// static
43const int TableHeader::kHorizontalPadding = 7;
44// static
45const int TableHeader::kSortIndicatorWidth = kSortIndicatorSize +
46    TableHeader::kHorizontalPadding * 2;
47
48typedef std::vector<TableView::VisibleColumn> Columns;
49
50TableHeader::TableHeader(TableView* table) : table_(table) {
51  set_background(Background::CreateVerticalGradientBackground(
52                     kBackgroundColor1, kBackgroundColor2));
53}
54
55TableHeader::~TableHeader() {
56}
57
58void TableHeader::Layout() {
59  SetBounds(x(), y(), table_->width(), GetPreferredSize().height());
60}
61
62void TableHeader::OnPaint(gfx::Canvas* canvas) {
63  // Paint the background and a separator at the bottom. The separator color
64  // matches that of the border around the scrollview.
65  OnPaintBackground(canvas);
66  SkColor border_color = GetNativeTheme()->GetSystemColor(
67      ui::NativeTheme::kColorId_UnfocusedBorderColor);
68  canvas->DrawLine(gfx::Point(0, height() - 1),
69                   gfx::Point(width(), height() - 1), border_color);
70
71  const Columns& columns = table_->visible_columns();
72  const int sorted_column_id = table_->sort_descriptors().empty() ? -1 :
73      table_->sort_descriptors()[0].column_id;
74  for (size_t i = 0; i < columns.size(); ++i) {
75    if (columns[i].width >= 2) {
76      const int separator_x = GetMirroredXInView(
77          columns[i].x + columns[i].width - 1);
78      canvas->DrawLine(gfx::Point(separator_x, kSeparatorPadding),
79                       gfx::Point(separator_x, height() - kSeparatorPadding),
80                       kSeparatorColor);
81    }
82
83    const int x = columns[i].x + kHorizontalPadding;
84    int width = columns[i].width - kHorizontalPadding - kHorizontalPadding;
85    if (width <= 0)
86      continue;
87
88    const int title_width =
89        gfx::GetStringWidth(columns[i].column.title, font_list_);
90    const bool paint_sort_indicator =
91        (columns[i].column.id == sorted_column_id &&
92         title_width + kSortIndicatorWidth <= width);
93
94    if (paint_sort_indicator &&
95        columns[i].column.alignment == ui::TableColumn::RIGHT) {
96      width -= kSortIndicatorWidth;
97    }
98
99    canvas->DrawStringRectWithFlags(
100        columns[i].column.title, font_list_, kTextColor,
101        gfx::Rect(GetMirroredXWithWidthInView(x, width), kVerticalPadding,
102                  width, height() - kVerticalPadding * 2),
103        TableColumnAlignmentToCanvasAlignment(columns[i].column.alignment));
104
105    if (paint_sort_indicator) {
106      SkPaint paint;
107      paint.setColor(kTextColor);
108      paint.setStyle(SkPaint::kFill_Style);
109      paint.setAntiAlias(true);
110
111      int indicator_x = 0;
112      ui::TableColumn::Alignment alignment = columns[i].column.alignment;
113      if (base::i18n::IsRTL()) {
114        if (alignment == ui::TableColumn::LEFT)
115          alignment = ui::TableColumn::RIGHT;
116        else if (alignment == ui::TableColumn::RIGHT)
117          alignment = ui::TableColumn::LEFT;
118      }
119      switch (alignment) {
120        case ui::TableColumn::LEFT:
121          indicator_x = x + title_width;
122          break;
123        case ui::TableColumn::CENTER:
124          indicator_x = x + width / 2;
125          break;
126        case ui::TableColumn::RIGHT:
127          indicator_x = x + width;
128          break;
129      }
130
131      const int scale = base::i18n::IsRTL() ? -1 : 1;
132      indicator_x += (kSortIndicatorWidth - kSortIndicatorSize) / 2;
133      indicator_x = GetMirroredXInView(indicator_x);
134      int indicator_y = height() / 2 - kSortIndicatorSize / 2;
135      SkPath indicator_path;
136      if (table_->sort_descriptors()[0].ascending) {
137        indicator_path.moveTo(
138            SkIntToScalar(indicator_x),
139            SkIntToScalar(indicator_y + kSortIndicatorSize));
140        indicator_path.lineTo(
141            SkIntToScalar(indicator_x + kSortIndicatorSize * scale),
142            SkIntToScalar(indicator_y + kSortIndicatorSize));
143        indicator_path.lineTo(
144            SkIntToScalar(indicator_x + kSortIndicatorSize / 2 * scale),
145            SkIntToScalar(indicator_y));
146      } else {
147        indicator_path.moveTo(SkIntToScalar(indicator_x),
148                              SkIntToScalar(indicator_y));
149        indicator_path.lineTo(
150            SkIntToScalar(indicator_x + kSortIndicatorSize * scale),
151            SkIntToScalar(indicator_y));
152        indicator_path.lineTo(
153            SkIntToScalar(indicator_x + kSortIndicatorSize / 2 * scale),
154            SkIntToScalar(indicator_y + kSortIndicatorSize));
155      }
156      indicator_path.close();
157      canvas->DrawPath(indicator_path, paint);
158    }
159  }
160}
161
162gfx::Size TableHeader::GetPreferredSize() const {
163  return gfx::Size(1, kVerticalPadding * 2 + font_list_.GetHeight());
164}
165
166gfx::NativeCursor TableHeader::GetCursor(const ui::MouseEvent& event) {
167  return GetResizeColumn(GetMirroredXInView(event.x())) != -1 ?
168      GetNativeColumnResizeCursor() : View::GetCursor(event);
169}
170
171bool TableHeader::OnMousePressed(const ui::MouseEvent& event) {
172  if (event.IsOnlyLeftMouseButton()) {
173    StartResize(event);
174    return true;
175  }
176
177  // Return false so that context menus on ancestors work.
178  return false;
179}
180
181bool TableHeader::OnMouseDragged(const ui::MouseEvent& event) {
182  ContinueResize(event);
183  return true;
184}
185
186void TableHeader::OnMouseReleased(const ui::MouseEvent& event) {
187  const bool was_resizing = resize_details_ != NULL;
188  resize_details_.reset();
189  if (!was_resizing && event.IsOnlyLeftMouseButton())
190    ToggleSortOrder(event);
191}
192
193void TableHeader::OnMouseCaptureLost() {
194  if (is_resizing()) {
195    table_->SetVisibleColumnWidth(resize_details_->column_index,
196                                  resize_details_->initial_width);
197  }
198  resize_details_.reset();
199}
200
201void TableHeader::OnGestureEvent(ui::GestureEvent* event) {
202  switch (event->type()) {
203    case ui::ET_GESTURE_TAP:
204      if (!resize_details_.get())
205        ToggleSortOrder(*event);
206      break;
207    case ui::ET_GESTURE_SCROLL_BEGIN:
208      StartResize(*event);
209      break;
210    case ui::ET_GESTURE_SCROLL_UPDATE:
211      ContinueResize(*event);
212      break;
213    case ui::ET_GESTURE_SCROLL_END:
214      resize_details_.reset();
215      break;
216    default:
217      return;
218  }
219  event->SetHandled();
220}
221
222bool TableHeader::StartResize(const ui::LocatedEvent& event) {
223  if (is_resizing())
224    return false;
225
226  const int index = GetResizeColumn(GetMirroredXInView(event.x()));
227  if (index == -1)
228    return false;
229
230  resize_details_.reset(new ColumnResizeDetails);
231  resize_details_->column_index = index;
232  resize_details_->initial_x = event.root_location().x();
233  resize_details_->initial_width = table_->visible_columns()[index].width;
234  return true;
235}
236
237void TableHeader::ContinueResize(const ui::LocatedEvent& event) {
238  if (!is_resizing())
239    return;
240
241  const int scale = base::i18n::IsRTL() ? -1 : 1;
242  const int delta = scale *
243      (event.root_location().x() - resize_details_->initial_x);
244  table_->SetVisibleColumnWidth(
245      resize_details_->column_index,
246      std::max(kMinColumnWidth, resize_details_->initial_width + delta));
247}
248
249void TableHeader::ToggleSortOrder(const ui::LocatedEvent& event) {
250  if (table_->visible_columns().empty())
251    return;
252
253  const int x = GetMirroredXInView(event.x());
254  const int index = GetClosestVisibleColumnIndex(table_, x);
255  const TableView::VisibleColumn& column(table_->visible_columns()[index]);
256  if (x >= column.x && x < column.x + column.width && event.y() >= 0 &&
257      event.y() < height())
258    table_->ToggleSortOrder(index);
259}
260
261int TableHeader::GetResizeColumn(int x) const {
262  const Columns& columns(table_->visible_columns());
263  if (columns.empty())
264    return -1;
265
266  const int index = GetClosestVisibleColumnIndex(table_, x);
267  DCHECK_NE(-1, index);
268  const TableView::VisibleColumn& column(table_->visible_columns()[index]);
269  if (index > 0 && x >= column.x - kResizePadding &&
270      x <= column.x + kResizePadding) {
271    return index - 1;
272  }
273  const int max_x = column.x + column.width;
274  return (x >= max_x - kResizePadding && x <= max_x + kResizePadding) ?
275      index : -1;
276}
277
278}  // namespace views
279